Adjustable screen for hammer mills



G. A. DELP Nov. 22, 1949 ADJUSTABLE SCREEN FOR HAMMER MILLS Filed Oct. 1, 1945 flll'lllllllllll //7/ /770/1 hwyae 4. W M

Patented Nov. 22,1949

STATES PATENT OFfF l CE sCRiJEN Fen R -MIDIJS fizrrayce-A. Delp, Wayland, 'Mich. Application wow 1, 1945,=seria1Nemesis (c1. an -s9) screen for a hammer mill which is rritatabW-suppo'r t'ed and "comprises segments of difieren' t mesh in which all "parts of the screen are effectively supported throughout the circumference thereof at all positions er adjustment.

Third, to provide an improved adjustable screen for hammer Iii-ills comprising sections *cf "different rnesh in which the screen is sup-ported for free rdtative d jiIStment a manner to prevent clogging.

Objects relating to details and -econom ies f ==Ithe invention will appear 'from the description to follow. The invention is de'fin'ed and poirited out in the claims. I Preferred embodiments of lustr'ated in the a'ccempanyirig which:

Fig; 1 is a fragmentary view of a hammer mill embodying my invention partially in vertical section, certain parts being shown ednventionally.

Fig. 2 is ;.an enlarged fragmentary view on a line corresponding to the broken line 2-2 of invention are-ildmittin r Fig. 1.

Fig. 3 is apersp'e'ctive View'dfon'e 'ofthe screen segments. Fig. 4 is (an enlarged perspective view 'showing structural details of the screen and of the driyen Tack members.

Fig. 5 is a fragmentary perspective "view "of a modified form or embodiment of ithe screen and fd-rivirrgmeans therefor.

Fig.16' is a fragmentaryplan view of the screen 'o-f the embodiment of Fig. 5.

'ZE'ig. 7;is va fragmentary. perspective view ofithe screen of the embodiment of Figs. 5 and 6.

The embodiment of my invention illustrated in Figs. 1 to 4 inclusive comprises a casing designated generally by the numeral I and having end Walls 2 which also constitute end walls for the cylinder. This casing is provided with a suitable base 3.

Within the casing I mount a segmental cylindrically curved cylinder side wall member 4, the details of connection to the end walls not being illustrated. The space between the ends 5. and 6 of this cylinder wall member is bridged by the segmental cylindrically curved screen supports 1 2 V which are preferably b'f aihgle se'ctioh aand 'secured zto the end walls x'o'f the casing.

"The screen designated generally by the numeral .8 comprises a plurality :of segmental sections 9 of .difierentiinesh secured together in end to end relation by the the plates Hi and con'sti tuting a complete annular cylil rder which em braces the side wall 3 and is supported thereby -anfol :by the support members '1 throughout the circumference of the screen, the screen being a "rotatable sliding fit on the cylinder.

. The screen is provided with annular iracks M --at aeachzedge, these i-racks being :made .up of segments "l2, thesegments being spot welded as in- -dicated at :l 3 to the screensections. This results a substantially ri-gid annular screen rotatably slidable :upon the "cylinder :and without binding thereon.

- The screen is adjusted by means of driving agears l-d-meshing with the racks H, the shaft i5 0f the gears being connected by. the gears .16 and -l=l;-to ?the shaft t8 of the motor [9. The motor and this driving connection are preferably ar hanged within the casing as shown in the draw- Themotor is controlled from the switch 20 --which;may be remotely located.

f he feed 'ihdpper 21 :prov-ided With/f2. feed means having ashaft 22 provided with a pulley 23. Eeedmhutes 24 extend from the feed hopper I to each side of the casing, delivering through the 'end walls of the :casing to the cylinder.

' The hammer rotor .25 is provided withsuit'able hammers, ithis being 9111611111366. on the shaft 26.

The teasing is provided with a discharge fan 2'7 deliviering to the discharge =chute -28.

With this "arrangen'ient of parts, the screen may-be quickly and easily adj u'sted Ito con'tr'ol the fineness of the product. The screen of the embodiment illustrated has three screens of differentme'sh.

in the embodiment shown in Figs. 5, 6 and f7, driven sprocket members 29 are provided -ir'iste'ad of the racks II. The sprocket chains 30 coact with these sprockets 29, the sprocket chains being driven from the driving sprockets 3| on the shaft 32 of the motor 33. An idler sprocket 34 holds the sprocket chain in effective mesh with the sprocket gears.

I have illustrated and described my invention in practical embodiments thereof. I have not attempted to illustrate or describe other embodiments or adaptations which I contemplate as it is believed that this disclosure will enable those skilled in the art to embody or adapt my inven-t tion as may be desired.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a hammer mill, the combination of a casing comprising parallel end walls, a cylinder comprising a segmental cylindrically curved side wall member mounted between said end walls and constituting a screen support, cylindrically curved screen support members mounted on said end walls to bridge the space between the ends of the cylinder side wall and complement said wall member, a substantially rigid cylindrical screen embracing and rotatably supported on said cylinder side wall member and said support members, said screen comprising a plurality of complementary segmental sections of different mesh connected end to end, annular racks at the edges of said screen, rack driving gears mounted within said casing to coact with said racks, said cylinder side wall member supportingly engaging the cylindrical screen inside thereof substantially opposite from said gears to support the screen against thrust away from said gears, a motor having driving connection with said gears, a control switch for said motor, and a hammer rotor mounted within said cylinder, said end walls being provided with inlets for said cylinder.

2. In a hammer mill, the combination of a casing comprising end walls, a segmental cylindrically curved cylinder side wall member extending between and secured to said casing end walls which constitute cylinder end walls, segmental cylindrically curved screen support members secured to said end walls to bridge the space between the ends of said cylinder side wall member, a substantially rigid cylindrical screen rotatably slidable on said cylinder side wall member and supports, said screen being rotatably slidably supported on the cylinder wall member on the side thereof diametrically opposite from said screen support members to facilitate rotatable slidable engagement of said screen with said support members, said screen comprising a plurality of segmental complementary sections of difierent mesh secured together end to end, annular driven members at the edges of said screen, driving members coacting with said driven members, manually controlled means for driving said driving members, and a hammer rotor within said cylinder.

3. In a hammer mill, the combination of a casing comprising end walls, a segmental cylindrically curved cylinder side wall member extending between and secured to said casing end walls which constitute cylinder end walls, segmental cylindrically curved screen support members se cured to said end walls to bridge the space between the ends of said cylinder side wall member, a substantially rigid cylindrical screen rotatably slidable on said cylinder side wall member and supports, said screen being rotatably slidably supported on the cylinder wall member on the side thereof diametrically opposite from said screen support members to facilitate rotatable slidable engagement of said screen with said support members, said screen comprising a plurality of segmental complementary sections of difierent mesh secured together end to end, means for rotating said screen, and a hammer rotor within said cylinder.

4. In a hammer mill, the combination of a casing, a cylinder comprising a segmental cylindrically curved side wall member constituting a screen support member, segmental cylindrically curved screen support members bridging the space between the ends of the cylinder side wall member, a cylindrical screen embracing and rotatably supported on said cylinder side wall member and said support members, said screen comprising a plurality of segmental sections of different mesh connected end to end, annular racks at the edges of said screen, rack driving gears coacting with said racks, said cylinder side wall member supportingly engaging the cylindrical screen inside thereof substantially opposite from said gears to support the screen against thrust away from said gears, and a hammer rotor within said cylinder.

5. In a hammer mill, the combination of a casing, a cylindrical cylinder disposed in said casing and having a discharge opening at one side, a cylindrical screen, bearing means including said cylinder disposed within and rotatably supporting said screen, said screen comprising a plurality of segmental sections of different mesh to be selectively positioned over said discharge opening, annular racks at the edges of said screen, rack driving gears mounted within said casing to coact with said racks, said bearing means engaging the screen inside thereof substantially opposite from said gears to support the screen against thrust away from said gears, a motor having driving connection with said gears, a control switch for said motor on the outside of said casing, and a hammer rotor within said cylinder, said cylinder being provided with an inlet at an end thereof.

GRAYCE A. DEL-P.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

